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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f973a4a783332482e9c4fc23082992051003db96fe3bf6681d3f34d676019ec' 
  AND token = 'fJH/7A/2CnVUmJWUmen3o0wC9Blb37Va18mhSTOfWsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}